Premier Aluminum, Racine, Wis., has shut down metalcasting production at its Allenton, Wis., facility and upgraded its Racine plant to compensate for the loss. Premier, which was purchased by private equity firm Ligon Industries, Birmingham, Ala., in August 2006, had maintained the two plants since 1990. According to the company’s new president Jason Dannenberg, the Allenton plant will remain open as a tool…